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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 03-02-2015, 12:37 AM   #1
Mezzome84
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Join Date: Mar 2015
Location: Omak
Posts: 75
My Ride: 2005 330i
Exclamation Rehashing Kbus issues...

Hi everybody,

I just bought my first BMW a few days ago. It is a 2005 330i with Navigation and the business radio.
Everything seemed fine at first (Aside from the airbag light and seatbelt light constantly on).
Today we were driving, listening to music, when the nav screen shut off and wouldn't respond. The radio/volume controls also did not work. We could barely hear music in the back ground.
Eventually, the screen turned back on but I wasn't able to access the Onboard computer option or settings. The volume controls were also very sluggish.
At that point, the signal lights stopped working as did the headlight controls.

I am a little worried as I have only had this car for a few days and I don't want a lot of huge electrical issues.
From my research, it could be the battery going bad, or issues with the Kbus (more likely).
We have found that whoever did previous work on the car was not electrically skilled...the wires were a mess and the headlights weren't connected right (among other things).
We did have the radio and nav system in the trunk disconnected today to fix wiring for the speakers.
Any ideas what to try next?
Could the airbag light and seat belt light be related to the other issues?
We have the battery disconnected right now to see if that helps.
I know this is rehashing an old topic, but I am frustrated and not sure what to do at this point.
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Old 03-03-2015, 12:43 AM   #2
Mezzome84
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Join Date: Mar 2015
Location: Omak
Posts: 75
My Ride: 2005 330i
Update on what is going on....we had moved the steering wheel yesterday. Upon moving it back into it's original position, the issues got much better. However, today I was still having issues, the navigation screen controls wouldn't work. Everything else was fine.
One other issue, I am not sure if it is related, is that high beams won't work. I can flash the halogens, but the HIDs I have won't engage in high beams. We have taken the head lights apart (that was a really botched up job, whoever did them first) but still nothing. we even tried to switch them to basic bulbs thinking the LCM wasn't coded properly for them. Still nothing.
We checked the fuses in the dash. Only one burnt was #30 for engine control (oil switch?). Is there any other location of a fuse box?
I would like to check the Kbus tomorrow, as that's the only other thing I can think of.
After that, it's a matter of checking all the grounding wires I guess...
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Old 03-03-2015, 09:55 AM   #3
Mezzome84
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Join Date: Mar 2015
Location: Omak
Posts: 75
My Ride: 2005 330i
Another update...last night we went through the Kbus and tested it removing the modules individually. Strangely, that I could tell the car didn't lose any functions at all the whole time. We did find 3 modules that when removed individually, they caused the voltage through the kbus to increase (from 10.8 to 11.2 or 11.3). I think if all three removed at the same time the voltage would increase more.
Not sure what to do at this point.
I have a car I bought on Saturday that is in pieces in the garage and barely works.....
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Old 03-04-2015, 12:52 AM   #4
Mezzome84
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Join Date: Mar 2015
Location: Omak
Posts: 75
My Ride: 2005 330i
For kicks and giggle I pulled the battery to check it out and test it. When I pulled it I found what looks like maybe a chopped up cabin air filter stuffed in there. And the battery was sitting on some 1x1 pieces of wood! WTF?! So then I test it, ehh its ok. Barely at 12 volts but we were playing with the cars lights and what not so it probably just needs charged. But I go find out that its way small for the car. Les Schwab specd a 780-790 CCA battery and the one in the car was 630 CCA. So I just said replace it, worth a shot. Better to have the right battery either way. I shouldn't say anything but the persistent problems have gone away. Hopefully they stay away. Seems to be these cars are quite particular about the correct voltage.
Thanks again!
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Old 03-04-2015, 08:58 AM   #5
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 6,042
My Ride: 2001 330Ci
You're 10000000% correct: these cars are chock full of electronics and the electronics are very finicky when it comes to voltage.
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